【摘要】 针对AC-13I型橡胶沥青混合料开展三点弯曲疲劳试验,并采用耗散能相对变化率定义损伤变量进行损伤演化过程分析;建立了这类混合料的耗散能、耗散能相对变化率与疲劳次数的关系式,以及基于耗散能相对变化率平稳值的疲劳方程.结果表明:AC-13I型橡胶沥青混合料的疲劳寿命随其耗散能相对变化率平稳值的增大呈幂函数趋势下降,根据建立的疲劳方程预测的疲劳寿命与实际疲劳寿命相对误差平均值为9.33%,说明所建立的疲劳方程能很好地预测AC-13I型橡胶沥青混合料的疲劳寿命;经验证,上述关系式以及疲劳方程同样适用于基质沥青混合料.更多还原

【Abstract】 The three-point bending fatigue tests of AC-13 I rubber asphalt mixture were carried out. The dissipated energy ratio(DER) was used to define damage variable and the damage evolution process was analyzed. The relations between dissipated energy(DE) and DER, and fatigue cycle number of the asphalt mixture were established. The fatigue equation based on the plateau value(PV) of DER was established too. The results show that the fatigue life decreases in power function with the increase of PV. The average relative error of the fatigue life predicted by the fatigue equation and the actual fatigue life is 9.33%, which indicates that the established fatigue equation can well predict the fatigue life of AC-13 I rubber asphalt mixture. It is verified that the established relations and fatigue equation are also applicable to base asphalt mixture.更多还原